usb: gadget: uvc: Remove uvc_set_trace_param() function

The function is never called, remove it.

Signed-off-by: Laurent Pinchart <[e-mail]>
Reviewed-by: Kieran Bingham <[e-mail]>

drivers/usb/gadget/function/f_uvc.c

···
 	NULL,
 };
 
-void uvc_set_trace_param(unsigned int trace)
-{
-	uvc_gadget_trace_param = trace;
-}
-EXPORT_SYMBOL(uvc_set_trace_param);
-
 /* --------------------------------------------------------------------------
  * Control requests
  */